Impact of setting the interval partitioning off and then on again

Hi all

Have discovered that to split the partitions of a partitioned table Beach-interval, in that we need to define the partitioning interval all issue the command split then on again.

e, g.

ALTER TABLE retailer_transaction SET INTERVAL ();

ALTER TABLE POR2_retailer_transaction

SPLIT PARTITION PART_400012 AT (TO_DATE (' 2020-09-01 00:00:00 ',' SYYYY-MM-DD HH24:MI:SS ',' NLS_CALENDAR = GREGORIAN '))

INTO (PARTITION PART_202008,

PART_400012 PARTITION)

ALTER TABLE retailer_transaction SET INTERVAL (NUMTOYMINTERVAL(1,'MONTH'))

Everything we need to pay attention to that?

Using oracle 11.2.0.3

Thank you

You can NOT split the LAST (most HIGH_VALUE) partition of a partitioned table interval interval. You can only separate partitions BEFORE the last. Which converts also all partitions from the bottom (split and below) for the partitions of the RANGE.

If interval partitioning will only apply to data added above the transition point (the score higher.

To return to your original question. To split the LAST interval follow the procedure described in your original post

1. range partitioning

2 split the partitioning

3 set the partitioning interval on

Conclusion with this however when adding data back to a nine month doesn't automatically create the partition again.

This "new month" MUST BE above the point of passage for a new partition to create. In your code example, this point of transition is for the year 4000.

This works very well for me:

ALTER TABLE sales PARTITION RENAME SYS_P1122 to SALE_400012

ALTER TABLE sale SET INTERVAL ();

ALTER TABLE SPLIT PARTITION for sale

SALE_400012 TO (TO_DATE('01/02/2020','DD/MM/YYYY')) IN

(

SALE_202001 PARTITION,

SALE_400012 PARTITION

);

ALTER TABLE sale SET INTERVAL (NUMTOYMINTERVAL(1,'MONTH'))

INSERT INTO sales

(SALES_DATE, STORE_NUM, QTY_SOLD)

values (to_date('31/12/4001','DD/,MM/YYYY'), 1, 10);

This last INSERT statement above creates a NEW partition because the date (31/12/4001) is above the transition point.

Looks like you want to move the transition point downwards. That is - you were using this year there date of 4000 as a 'catch all '.

1. set the partitioning interval

2 split that last partition into two NEW partitions (new names) by using a VALUE that is high enough to contain ALL the data you have in this last partition.

3. remove the last partition - it should now be empty

4. turn on range partitioning

Now, any data that you insert above this NEW point of transition (the limit that you used for the new partition) it will create a new partition of the interval. Make sure the border is really an end of month, if that's what you want.

If your data sample had this

INSERT INTO sales

(SALES_DATE, STORE_NUM, QTY_SOLD)

values (to_date('05/10/2016','DD/,MM/YYYY'), 1, 10);

INSERT INTO sales

(SALES_DATE, STORE_NUM, QTY_SOLD)

values (to_date('31/12/4000','DD/,MM/YYYY'), 1, 10);

So for the step #2 above use split date 06/2016 so that the line above for 10/05/2106 goes to the new partition and 12/31/4000 stays in the old.

Then, drag this old and lines in it (31/12/4000).

You can NOT split the last partition if interval is always on because it is the last partition interval.

And as long as you have given for 12/31/4000, you will get no new partitions unless you insert was more TOP than this.

So if you want partitioning interval to activate again 06/2016 that higher data would be deleted and the score he falls.

You have discovered only among "traps" with the help of partitioning of the interval. Oracle will happily create new partition needed to keep the data. If ANYONE, even accidentally, between a date as 12/31/4000 that nobody would ever know until the new data seem to DISAPPEAR for some use cases.

This is because all data will start to enter this new partition ACCIDENTALLY created instead of a partition for the month, it's part.

And, and you have discovered, you cannot split this partition directly.

Delayed segment creation can allow you to pre-create the partitions ahead without actually affecting the segment for them until the first row is inserted.

Interval partitioning will create the appropriate partitions but not if someone accidentally or intentionally, data will be a valuable capitalized in the table.

Tags: Database

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